Table 1

Effects of log-transformed water volume and leaf litter mass on relative abundances of treehole insects

Species

N

R2

F

PF

Parameter

Coefficient

SE

t

Pt


A. triseriatus

233

0.041

6.00

0.003

Water vol

0.22

0.10

2.19

0.03

Leaf mass

0.042

0.03

1.33

0.18


T. rutilus

89

0.028

2.27

0.11

Water vol

-0.51

0.32

-1.57

0.12

Leaf mass

0.21

0.11

1.97

0.052


C. guttipennis

202

0.32

48.52

0.0001

Water vol

1.35

0.21

6.30

<0.001

Leaf mass

0.22

0.06

3.98

<0.001


H. pulchella

160

0.088

8.70

0.004

Water vol

0.63

0.26

2.44

0.016

Leaf mass

0.11

0.073

1.52

0.13


M. posticata

45

0.14

4.43

0.019

Water vol

0.54

0.36

1.51

0.14

Leaf mass

0.22

0.11

1.92

0.06


T. albipunctatus

98

0.078

5.09

0.008

Water vol

0.25

0.34

0.74

0.46

Leaf mass

0.29

0.10

2.84

0.005


Systenus sp.

21

0.51

11.39

0.007

Water vol

1.22

0.45

2.69

0.015

Leaf mass

0.44

0.15

2.97

0.01


Results of randomization regressions on inverse-transformed relative abundances vs. the log-transformed water volume and leaf litter mass. N = sample size, R2 = proportion of variation explained by the model, F = regression model test statistic, PF = probability value associated with F statistic, SE = standard error of the coefficient estimate, t = test statistic for coefficient, Pt = probability associated with t-statistic. Y-intercepts not shown, but all were significantly greater than zero (P < 0.001). Aedes triseriatus relative abundances were not transformed, as transformation did not improve linearity.

Paradise et al. BMC Ecology 2008 8:22   doi:10.1186/1472-6785-8-22

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